Hypodermic-syringe protector



M. a. CARTER uYPonERuIc smlgms PROTECTOR Filed Dec. 27, 1923 protector,

Patented Oct. 6, 1925.

UNITED? STATES Moscow 28. CARTER, or FRANKLIN, 'rmmnssmtlnYronnnMIc-sYnINGE PROTECTOR.

Application ma December 27, 1923. Serial No, 682,971.

To all whom it may concern:

Be it known that I, Moscow B. CARTER,

acitizen of the United States, residing at Franklin, in the county ofWilliamson and State of Tennessee, have invented certain new and usefulImprovements in Hypodermic-Syringe Protectors; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same. The present invention has for itsobject the provision of an attachment to beapplied to hypodermicsyringes to protect the same {and enable a great pressure to be exerted"without endan ering the instrument to the extent of breaking the barreland to holdthe needle and syringe together when administering aninjection into dense tissue.

The invention provides a protector or shield which transfers thepressure to the forward or nozzle end of the, syringe when the latter isin active operation, said attachment positively engaging the hub of theneedle to prevent separation of the latter from the syringe whenadministering an injection.

The device also provides means by which the withdrawal of the needle isinsured when removing the syringe after administering an injection, andby which the more pressure that is applied to the plunger the tighterthe needle will be held in place.

Other objects and advantages will be apparent and suggest themselves asthe nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it isto beunderstood that in adapting the same to meet different conditions andrequirements, various changes in the form, proportion and minor detailsof construction may be resorted to without departing from the spirit ofthe invention.

Referring to the accompanying drawings forming a part of theapplication:

Figure 1 is an elevational view of the Figure 2 is a side view thereof,

Figure 3 is a top end view,

Figure 4 is a side view of a hypodermic syringe with the protector inposition,

Figure 5 is a sectional view on the line 55 of Figure 4, and

Figure 6 is a sectional view on the line 6-6 of Figure 4.

Corresponding and like parts are referred to in the followingdescription and designated in the several views of the drawings by likereference characters.

The hypodermic syringe illustrated is of well known construction andcomprises a barrel 1 having a nozzle 2 at one end and an outer flange 3at its opposite end to engage a cross-bar 4 and friction spring 5, thelatter exerting a lateral pressure upon a side of the plunger 6 toprevent casual displacement thereof in the handling of the instrument.

The needle 7 is provided with the usual hub 8 which receives the outerend of the protector, which prevents passage of the flange 10therethrough with the result that the needle is positively held in theend of the protector, as shown most clearly in Figure 4:.

The protector comprises side members 13 adapted to extend along oppositesides of the barrel 1 which is held therebetween. The members 13 areconnected at one end bymeans of a yoke 14, in which the opening 12 isformed. Fingerpieces 15 are provided at the opposite end of the members13, and adjacent the fingerpieces 15 clips 16 are provided to engageabout the upper portion of the barrel 1 and retain the protector inposition thereon. The clips 16 of one member are adapted to engage theclips of the companion member and thereby hold both members when pressedtogether about the barrel 1 of the syringe. The members 13 as well asthe clips 16 are resilient, thereby adapting the protector for slightvariation in different syringes and in practice the component parts ofthe protector are of integral formation, thereby obviating joints andsimplifying the structure.

When using the syringe, the elements 15 engage the first and secondfingers of the hand, thereby leaving the thumb free to exert a pressureupon the plunger. It is observed that the pressure is transferred by theprotector to the forward or nozzle end of the barrel, thereby preventinginjury to the latter when applying the force necessary to cause theneedle to penetrate dense tissue. Moreover, the positive connectionbetween the protector and the needle prevents the latter from beingforced off when the instrument is in service.

Vhat is claimed is: V

A protector for hypodermic syringes made from a blank, the samecomprising side members, a yoke connecting the members at one end andhaving'an-elongatedopening therein, said opening having parallel Wallsand c'ur'ved Walls joining the'pa'rallel Walls, 10

the yoke being continuous about the openfingerpieces to secure the sidemembers when brought together.

In testimony whereof I afiix my signature.

MOSCOWV B. CARTER.

